Growth led by an additional 740,000 Mexican immigrants, according to Center for Immigration Studies

A new analysis of legal and illegal immigrant counts by the Census Bureau revealed Thursday that there is a record 42.1 million in the United States, an explosion that is being driven by Mexicans flooding across the border.

In a report provided to Secrets by the Center for Immigration Studies, the total immigrant population surged 1.7 million since 2014. The growth was led in the last year by an additional 740,000 Mexican immigrants.

The 42.1 million tabulated by Census in the second quarter represent over 13 percent of the U.S. population, the biggest percentage in 105 years.

What’s more, the numbers of immigrants coming and going from the U.S. is actually higher since many return home every years, said the report. “For the immigrant population to increase by one million means that significantly more than one million new immigrants must enter the country because some immigrants already here return to their homeland each year and natural mortality totals 250,000 annually,” said the Center.